umm so my birthday is next month and i'm having a party and i have no idea what to wear

i'm all consumed with everything else that i haven't thought about what to wear. i don't wanna mess around and wait until the last minute so i'm asking you peeps for help

my size range now is like 12-16 depending on the manufacturer/style/etc.

i want something sexy that i can dance all night in and it doesn't have to be a dress. i want to look like a grown woman and not a little girl.

help me please!

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gnap.